<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
    //we can include this file in all our files
    //this way, every file will contain all our functions and exceptions
    require_once('data_valid_fns.php');
    require_once('db_fns.php');
    require_once('user_auth_fns.php');
    require_once('output_fns.php');
    require_once('url_fns.php');
?>